Transmission lock



l 1,631,157 w. M. REASON June 7,1927.

' TRANSMISSION LocK Filed Dec. 14. 1922 Y Illll Patented June 7, 1927A.

UNITED sTArl-:s

. A1,631,151 ATENT OFFICE.

WALTER M. REASON, OF PONTIAC, MICHIGAN; ASSIGNOR TO ELIZABETH BALLAMOS,

- vOIF PONTIAC, MICHIGAN,

TRANSMISSION Loox.

Application filed December 14, 1922. Serial No. 606,943.

This invention relates to transmission locks and the object of the invention is'to provide a lock for locking the vtransmission gears of an automobile'in the neutral posi-A tion. Another object ofthe invention is to provide va transmission lock which cannot be easily tampered with'and which will notV easily get out of order. A further object of the invention is to provide a lock for the transmission gears of an automobile in which the device canonly be locked when the gear shift is in the vneutral' position. The principal object ofthe invention is'tol provide a means for preventing theft of. an automobile by locking the gear shifting mechanism so that none of the gears can be brought tov driving` engagement and also to provide a means whereby the gearshift lever is locked and held fr m movement.

shown in the accompanying drawings inwhich- Fig. v1 is a section through a transmission cover and lock embo'dying'my invention.

2 isa similar sectionshowing the locking'mechanism in the unlocked position.

Fig. Sis akvplan view partiallyinv section' to show the construction.l l

' Fig. tis a sectionvtaken on line 4 4 of F 1. i i

Fig. 5" isa section taken on line 5 5 of Fig. 3. t t .l

As will 'be' understood from Fig. 1th@ variable speed gears aremounted in the transmission casing 1 beneath the gear shiftfil ing mechanism shownin Fig.VV 1. A pair of shafts 2 and 3 are slidably mounted. in the cover i for the casing. A member 5 shown in Figs'. 3 and 5 `is secured to the shaft 2 by the set screw 6 and the member 5 carries ai yoke 7 for operating the low'speed and reverse gears. Thelm'ember 5 is provided with a notch 9 to receive the lower end 10 ofthe gear shift lever 11 aswill'be readily A further object of the inven ion is to provide a transmission cover carrying the gear shifting' mechanism understood from Figs. l and 3. A member 12 similar to the member 5 is secured to the yoke l4l`kfor shifting the intermediate and highspeed gears, the member 12 beingl also provided with a notch 15 for receiving the end 10 of the gear shift lever, and when thcy lgears are in neutral position the notches 9 and 15 are positioned opposite each other as shown in Fig. 3. The gear shift lever 11 is provided with a ball shaped portion 18 which fits ina socket provided in' the upshaft 3' by the set screw 13 and carries a wardly extending portion 17 of the trans- 'mission covering and-provides a pivot for the gear shiftlever. The cover 4" for the transmission casing is provided with an upwardly extending recessed portion 19 having` a case hardened tool steel shell 20 which is made a press fit thereon and prevents tampering. with the lock or cutting off the locking portion of the transmission" cover 4. A longitudinally movablev lock barrel 2l is provided in the recess of the portion 19:

and is heldfrom rotation by a pin 22 engagii'igin a groove 23 provided in the nonrotatable portion 21 offthe lock. The lock is provided with a locking bolt 24 which may be moved outwardly or 'withdrawn'by rotation of the key`25'which rotates the 'cylindrical portion 16 of the'lock as will be readily understood.` A` pin 26 is secured in the cover4'as shown in Figs. 1, 2 and 4t and a locking block 27 is supported on the pin 26. A pin.l 28 is secured to the outer portion 2l of the lock and extends through to engage the locking block 27,. a flat spring 29 beingfsecured Vto the cover 4L and being adapted to hold the block 27 in Contact with thepin 2S. As shown in Fig. 4; the shafts' 2 and 3 are provided with notches 30 which are positionedtopposite each other wlienthe gearshifting mechanism' is inthe neutral position. The block 27 isv provided with lugs 31 which are adapted to tit in the notches 30 when the device isin the 'neutral position and prevent operation' ofl the gear shift 'by movement of the shafts 2 and The cover' 4 is provided with a` depending portion 32 in which the shafts 2 and 3 are slidably mounted and this portion 82 is provided with a shallow groove 33 in which the lug 84, on the block 27 is adapted toen# gage the groove"thu'siforining a guide for the'. locking block. Theyoke'7 is provided -oo anrv aperture inl the cover L and is adapted( with an arm which extends beneath the flange 36 of the casing 1 and the yoke 14 is provided with an arm 37 which extends beneath the flange 38 of the casing 1 as shown in Figs. 3 and 5, the fiange 38 being provided with a notch 39 through which the arm 37 may be moved to position beneath the flange 38.

To assemble the device the edge 40 of the Acover 4 is rested on the flange 36 of the cas ing 1 in an angular position so that as the cover 4 is turned down to position the opposite edge thereof on the flange 38, the arm moved downward from the position shown in Fig. 2 to that shown in Fig. 1, the pin 28 forcing the locking block 27 to the locking position with the lugs 31 engaging the notches 30 of the shafts 2 and 3 as shown in Figs. 1 and 4. At this time the key is turned which forces the locking bolt 24 outwardly into the recess provided therefor in the portion 19 which holds the parts in the locked position. At this' time the bolts 41 may be removed but it will be impossible to remove the cover from the casing on account of the arms 35 and 37 engaging beneath the anges 36 and 38. An upwardly extending flange 42 is provided at the end of the casing 1 as shown in Fig. 1 behind which the edge of the cover 4 engages. lVithout this construction the bolts 41 might be removed and by moving the entire cover and locking mechanism to, the left of Fig. l or 3 the arm 3T could be brought to position beneath the notch 39 at which time the transn'iission cover and lock couldL be removed from the transmission casingl. By providing the flange 42 the transmission cover cannot be so moved and due to the arms 37 and 35 extending closely beneath the flanges 36 kand 38 the edge of the cover cannot be lifted to sufficient height to clear the upwardly extending flange 42. To

c unlock the device the key 25 is inserted in the rotatable portion 16 of the lock and is turned to retract the'locking bolt 24 at which time the spring 29 forces the block 27 upwardly which,l due to its engagement with the pin 28, forces the lock and barrel upwart ly to the position shown in Fig. 2 thus unlocking the device. When the device is unlocked the cover may be removed from the casing 1 by withdrawing the bolts 41 and shifting the yoke 14 by means ofthe gear shift lever 11 to position beneath the lock 39,

rmission operating mechanism but, removal of the cover (which merely requires the taking ont of a few screws), removes the op-A erating lever and lock and enables a person, if bent on theft, to drive the car away as it only` requires after removal ofthe cover to shift the gears by a small bar ofany type as for instance a large screw' driver.y Thus such vlocks in reality do not prevent thetheft of a car. LBy my arrangement in which the cover is locked to the case when the gear shifting mechanism is locked such theft and tampering with the mechanism is prevented.

From the foregoing description it becomes evident that the device is very simple and emcient in operation, will not easily get out of order, is composed of few parts and is of consequent low manufacturing cost', and provides a device which accomplishesthe objectsv described. I Y

Having thus fully described my invention,

what I claim i's- Y 1. A transmission lock including a pair of operating members for the transmission, the

said members being each provided with a notch adapted to be brought to opposed rela-v tion when in the neutral position, ajlock comprising a longitudinally movable non-rotat able portion, a rotatable portion therein op-V erable by a key, .a locking block pivotally secured within the transmission casing and having` lugs thereon adapted to engage in` the notches of the operating members whenY in theneutral position, a pin on the longitudinally movableportion of the lock en-` gaging the locking block, a spring holding the locking block in engagement with the said pin, a locking bolt carried by the'n'onrotatable portion of the' lock adapted'when extended to prevent longitudinal movement of the lock, the arrangement being such that rotation of the key retracts thelockingv bolt. and allows upward movement of the locking block and lock by the' spring.

2. A transmission lock including a pair of operating members for the transmission, the said members being each provided with a notch adapted to bebrought to opposed relation when in the neutral position,ra lock comprising a longitudinally movable nonrotatable portion, a rotatable portion therein operable by a key, a locking bolt adapted to Many transmission locks llo f be extended or retracted by rotation of the key, the locking bolt when in the extended position preventing longitudinal movement of the look, a looking block pivotally secured Within the transmission cover and having lugs thereon adapted to engage in the notches of the operating members when in the neutral position, a pin extending longitudinally from the non-rotatable portion of the look and engaging the looking block, a spring holding the locking block in engagement with the said pin and means carried by the operating members preventing removal of the cover from the casing when in the neutral position.

In testimony whereof, I sign this specification.

WALTER M. REASON. 

